Question

A college textbook costs $90.00, the
sales tax rate is 6.5%, then how much w
The tax be?​

Answer 1

$\bf \begin{array}{|c|ll} \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{6.5\% of 90}}{\left( \cfrac{6.5}{100} \right)90}\implies 5.85$